Disappearing Traffic Studies

“Disappearing traffic, also sometimes referred to as suppressed traffic or traffic evaporation, relates to the observation that when highway capacity is reduced (typically due to provision of lanes for buses, street-running trams or bicycles, wider pavements (sidewalks), pedestrianisation, closures for road maintenance, or natural disasters) some proportion of the traffic disappears, resulting in fewer problems of congestion than had been expected.”(source)

“Induced demand” is the “build-it-and-they-will-come” theory of driving.